will a rear counterweight off of a jspec s4 13bt work on a s4 na block?

 

If you are talking an S4 automatic Transmission Flex plate Counterweight,Then Yes..Just Keep within the car's Series ..as in s4 to s4 and S5 to S5.(If what you are doing is using a rear counterweight to go to an Aftermarket Light flywheel)..The Rear counterweight for a Manual Engine is Located on the Flywheel.It is Integrated as part of the Rotating assembly Itself.

 

thats what i thought and i knew about the series difference. thanks for the response.

 

quick question... how can u tell the difference between series